Show-stopping lilies (Lilium) are surprisingly easy to care for, says Peggy Anne Montgomery, horticulturist for Flowerbulb.eu. "Lilies are generally low-maintenance plants," she says. "They require a sunny site and well-draining soil but don't demand constant attention." Montgomery suggests growing Asiatic lilies if you prefer a fragrance-free flower or Oriental lilies if you'd like to infuse your garden with some fragrance.